Merge with 4.0 (Fix bug in LEFT JOIN and EXPLAIN on empty table)

mysql-test/r/explain.result:
  Auto merged
mysql-test/t/explain.test:
  Auto merged
mysql-test/t/join.test:
  Auto merged

2 files changed, 12 insertions, 4 deletions

diff --git a/mysql-test/t/explain.test b/mysql-test/t/explain.test
index 3e33d58215e..1cf8c5e93e1 100644
--- a/mysql-test/t/explain.test
+++ b/mysql-test/t/explain.test
@@ -5,6 +5,7 @@
 drop table if exists t1;
 --enable_warnings
 create table t1 (id int not null, str char(10), unique(str));
+explain select * from t1;
 insert into t1 values (1, null),(2, null),(3, "foo"),(4, "bar");
 select * from t1 where str is null;
 select * from t1 where str="foo";
@@ -14,8 +15,10 @@ explain select * from t1 ignore key (str) where str="foo";
 explain select * from t1 use key (str,str) where str="foo";
 
 #The following should give errors
-!$1072 explain select * from t1 use key (str,str,foo) where str="foo";
-!$1072 explain select * from t1 ignore key (str,str,foo) where str="foo";
+--error 1072
+explain select * from t1 use key (str,str,foo) where str="foo";
+--error 1072
+explain select * from t1 ignore key (str,str,foo) where str="foo";
 drop table t1;
 
 explain select 1;
diff --git a/mysql-test/t/join.test b/mysql-test/t/join.test
index 653b4271fe8..2a3b8488ca0 100644
--- a/mysql-test/t/join.test
+++ b/mysql-test/t/join.test
@@ -21,13 +21,18 @@ insert into t1 values (105);
 insert into t1 values (106);
 insert into t1 values (107);
 
-insert into t2 values (107);
-insert into t2 values (75);
+insert into t2 values (107),(75),(1000);
 
 select t1.id, t2.id from t1, t2 where t2.id = t1.id;
 select t1.id, count(t2.id) from t1,t2 where t2.id = t1.id group by t1.id;
 select t1.id, count(t2.id) from t1,t2 where t2.id = t1.id group by t2.id;
 
+#
+# Test problems with impossible ON or WHERE
+#
+select t1.id,t2.id from t2 left join t1 on t1.id>=74 and t1.id<=0 where t2.id=75 and t1.id is null;
+explain select t1.id,t2.id from t2 left join t1 on t1.id>=74 and t1.id<=0 where t2.id=75 and t1.id is null;
+explain select t1.id, t2.id from t1, t2 where t2.id = t1.id and t1.id <0 and t1.id > 0;
 drop table t1,t2;
 
 #